Cron expressions are used to configure instances of CronTrigger, a subclass of org.quartz.Trigger. A cron expression is a string consisting of six or seven subexpressions (fields) that describe individual details of the schedule.
These fields, separated by white space, can contain any of the allowed values with various combinations of the allowed characters for that field. Table A-1 shows the fields in the expected order.
There are many pages that can teach you how to write a cron expression, I will describe the main format used for the scheduled WebJob.
The cron parsing is implemented by NCrontab nuget package.
The cron expression is composed of 6 fields: {second} {minute} {hour} {day} {month} {day of the week}.
The supported operators are: , - * /
Each field can have a specific value (1), a range (1-10), a set of values (1,2,3), all values (), an interval value (/2 == 0,2,4,6,...) or a mix of these (1,5-10).
Each value represents a point in time, for example: "5 * * * * *" - means on the 5th second of every minutes --> 00:00:05, 00:01:05, 00:02:05, ... (and not every 5 seconds).
Samples
0 0 13 * * * - 1pm every day.
0 15 9 * * * - 9:15am every day.
0 0/5 16 * * * - Every 5 minutes starting at 4pm and ending at 4:55pm, every day.
0 11 11 11 11 * - Every November 11th at 11:11am.
Ref: docs.oracle.com
Bhuvan
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